<template>
  <div>
    <p>{{allChecked}}</p>
    
  </div>
</template>

<script>
export default {
  data () {
    return {
      arr : [{
    name: "小明",
    age: 18
}, {
    name: "小花",
    age: 25
}, {
    name: "小爱",
    age: 21
}]
    }
  },
  computed: {
    allChecked(){
     return this.arr.reduce((sum,obj)=>{
        return sum+=obj.age
      },0)
    }
  }
}
</script>

<style>

</style>